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FABACEAE (Leguminosae) LEGUME FAMILY

Martin F. Wojciechowski, except as noted

Annual to tree. Leaf: generally alternate, generally compound, generally stipuled, generally entire, pinnately veined Inflorescence: generally raceme, spike, umbel or head; or flowers 1–few in axils. Flower: generally bisexual, generally bilateral; hypanthium 0 or flat to tubular; sepals generally 5, generally fused; petals generally 5, free, fused, or lower 2 ± united into keel (see 3, Key to Groups, for banner, wings); stamens 10 or many (or [1], 5, 6, 7, 9), free or fused or 10 with 9 filaments at least partly fused, 1 (uppermost) free; pistil 1, ovary superior, generally 1-chambered, ovules 1–many, style, stigma 1. Fruit: legume, including a stalk-like base (above receptacle) or not. Seed: 1–many, often ± reniform, generally hard, smooth.
± 730 genera, 19400 species: worldwide; with grasses, requisite in agriculture, most natural ecosystems. Many cultivated, most importantly Arachis, peanut; Glycine, soybean; Phaseolus, beans; Medicago, alfalfa; Trifolium, clovers; many orns. [Lewis et al. (eds) 2005 Legumes of the World. RBG, Kew] Unless stated otherwise, fruit length including stalk-like base, number of 2° leaflets is per 1° leaflet. Upper suture of fruit adaxial, lower abaxial. Anthyllis vulneraria L. evidently a waif, a contaminant of legume seed from Europe. Laburnum anagyroides Medik., collected on Mount St. Helena in 1987, may be naturalized. Ceratonia siliqua L., carob tree (Group 2), differs from Gleditsia triacanthos L. in having evergreen (vs deciduous) leaves that are 1-pinnate (vs 1-pinnate on spurs on old stems, 2-pinnate on new stems) with 2–5(8) (vs 7–17) 1° leaflets, commonly cultivated, now naturalized in southern California. Aeschynomene rudis Benth. <Noxious weed>, Halimodendron halodendron (Pall.) Voss <Noxious weed> (possibly extirpated), Lens culinaris Medik. are agricultural weeds. Caragana arborescens Lam. only cultivated. Ononis alopecuroides L. <Noxious weed>, Sphaerophysa salsula (Pall.) DC. <Noxious weed> all evidently extirpated. Cercidium moved to Parkinsonia; Chamaecytisus to Cytisus; Psoralidium lanceolatum to Ladeania. —Scientific Editors: Martin F. Wojciechowski, Thomas J. Rosatti.

Key to Fabaceae

ACACIA

David Seigler & John E. Ebinger

Shrub, tree, armed or not; generally evergreen. Leaf: even-2-pinnate or, if simple, true blades 0, petioles, main axes blade-like, with 1 prominent midvein or >= 2 generally prominent longitudinal veins; generally alternate, generally with a swollen, joint-like thickening at base that governs orientation, main axis with raised glands or not. Inflorescence: head, generally axillary, 1 or in raceme or panicle, or flowers in spike; staminate flowers often present. Flower: radial; sepals, petals 4–5, inconspicuous; stamens many, conspicuous, exserted, free; ovary simple. Fruit: generally dehiscent, occasionally tardily so, flat or ± cylindric. Seed: aril generally enlarged, forming cap or completely encircling seed.
± 960 species: tropics, subtropics, especially Australia. (Greek: sharp point) [Orchard & Wilson 2001a, 2001b, (eds) Fl Australia. Vol 11. Mimosaceae, Acacia, part A and B. ABRS] Recognition of Acacia, Senegalia (including Acacia greggii), Vachellia (including Acacia farnesiana) current consensus; many Australian species cultivated, including Acacia cultriformis G. Don, Acacia elata Benth., some naturalized, spreading in California.
Unabridged references: [Orchard & Wilson 2001a, 2001b, (eds) Flora of Australia. Volume 11. Mimosaceae, Acacia, part A and B. Melbourne]

Key to Acacia

A. mearnsii De Wild. BLACK WATTLE
WAIF
Tree < 10 m, unarmed. Stem: bark often exuding gum; twig angled, short-hairy. Leaf: 2-pinnate, < 14 cm, olive-green; petiole 5–30 mm, short-hairy; main axis with raised glands at most pairs of 1° leaflets and generally between; 1° leaflets 7–31 pairs, 15–70 mm; 2° leaflets 20–70 pairs, 1.5–3.5 mm, 0.5–0.8 mm wide, linear. Inflorescence: raceme, occasionally panicle of 20–35 heads, ± = leaf. Flower: pale yellow to cream. Fruit: 3–14 cm, 4–8 mm wide, straight, flat, ± leathery, dark brown, ± hairy. Seed: aril light yellow, club-shaped, forming cap.
Uncommon. Disturbed areas; < 500 m. South Coast; Native to eastern Australia. Confused with Acacia dealbata. Naturalization unconfirmed. Feb–Mar [Online Interchange]

Previous taxon: Acacia longifolia
Next taxon: Acacia melanoxylon

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 21 2014
Citation for this treatment: [Author of taxon treatment] 2013. Acacia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=11645, accessed on Oct 21 2014

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Geographic subdivisions indicated for the distribution of Acacia mearnsii Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.